Claudia Aderotimi, 20, traveled from London to the United States for the silicone injections and died after suffering medical complications following the treatment performed in a Philadelphia hotel room, Britain's Daily Telegraph reported Friday.
Police were reportedly still searching for a transgender suspect believed to have administered the fatal injections.
Aderotimi's former boyfriend said the aspiring dancer and model had undergone a similar procedure just months earlier.
Paul Djimo, 20, said he was shocked to learn Aderotimi, who was from Nigeria but lived in London, had returned to the United States for a second procedure.
"After she had the injections last time, she told me she couldn't take the pain and wouldn't do it again," Djimo said. "I never thought she would go back."
"Claudia wanted to be a superstar. She had big dreams," Djimo said.
"Her death is absolutely devastating."